I learned Esperanto when I was pretty young. Although I wouldn’t regard it as the right candidate for the purpose of being the world’s second language, I’m definitely glad I learned it. By knowing Esperanto as a kid/teen from the imperial core, I ended up casually chatting with people from China, Iran, and central Africa (mainly Burundi, Republic of the Congo and Democratic Republic of the Congo), regularly listening to radio programs from Cuba, China, and Poland, and seeing lots of Esperanto art and culture that had been made in the Soviet Union. It really did introduce me to a lot of different perspectives that, at the time, I didn’t realize were basically censored where I came from. And of course in general I met people from many countries. I would say that in any random conversation or community, I mostly met people from Europe, Brazil, and China.

The usual criticisms of it are pretty much valid in my view. However, just taking it as one language among many rather than pushing it as “the” solution for a world auxlang, I think it’s worth studying a bit if it intrigues you. I’d say another valuable thing I learned by being in the Esperanto speaking ‘sphere’ since a young age is that I really saw what kind of things it takes to get people organized to do something, what it takes to popularize an idea, and what kind of stuff absolutely does not work for getting people to believe or do something (there’s a lot of that in Esperanto communities lol). It’s also interesting to watch the development of the language, because it is a living language that grows and changes on its own at this point, while also having a regulating body, and a ton of highly opinionated idealists arguing constantly about this stuff. In that sense I find it an interesting window into how people manage and conceive of development in things. Finally I think it’s an instructive case in observing the growth and development of an auxlang, which could aid future, improved projects in that vein.

Having studied a few different languages, I will say that in my opinion, Esperanto lives up to the claim of being easy to learn. If you speak a Romance language it will be especially smooth sailing. When I have spoken with people who learned it from a completely non-European language background, they said it took a while to learn the vocabulary and that the pronunciation was difficult in some regards, but it was otherwise easy compared to natural European languages, which I would guess is owing to its lack of irregularities in grammar and spelling, its flexibility in grammar, the lack of demand that people have a particular accent, and the lack of strict collocations.

A lot of people dislike it that Esperanto lacks certain cultural things that natural languages have. IMO that kind of comes with the territory of learning a constructed language. Personally, I think it’s fun, as it creates kind of a playful/creative atmosphere. Esperanto serves as more of a tool or vehicle for sharing cultural things than as a deep well of culture in and of itself.

Like most things, the Esperanto community is full of liberals. This becomes somewhat balanced by the community itself being focused on trying to meet people from other countries and the community having a general curiosity for the world and wanting to do cultural exchange. But you will find many liberal and some reactionary opinions flying around in Esperanto communities. The idea/original “plan” behind Esperanto was pretty idealist (although I do think conlangs can have very real, useful applications worth exploring), so the community has a bit of that in its veins.

Personally, I am happy I learned it. I don’t use it frequently these days, but I do enjoy listening to a few songs, and I’ll always be happy about the friends I made, or to randomly run into someone else who speaks it and have a chat. Is it something I highly recommend? No, not really. But if it interests you, I think it’s something fun to do, and you’ll meet new people, and may find chances to travel or work using the language if you really look (you’d be most likely to find work in Europe or China using Esperanto if you managed to do so).

Final note: You can take a VR tour of an Esperanto museum in China here. I thought it was pretty cool.